A complain

Greetings,I bought a phone from them 2018 online and they told me everything about it including how am I going to pay and how much and I agreed to that,but when the time goes on I got sick and I didn't manage to pay because I was not working for six months and after that six months I got a call from lawyers telling me that my account was handed over to them because I failed to pay as I agreed,then I agreed because I know that I was not paying,so I started paying to those lawyers until I got a call from another Company called MBD says I'm owing vodacom and I should pay and I got confused because I paid to the first lawyers...So now I don't know how is this happening to be handed over to 2 different lawyers for one account...please help me out from this one